Self-hardening alloys



SELF-HARDENlNG ALLQYS Enrico M. Zampieri, Union City, N. J., and Arthur '1. Cape, Los Angeles, Calif., assignors to Coast Metals, Inc., Little Ferry, N. 1., a corporation of New Jersey No Drawing. Application November 4, 1954, Serial No. 466,934

2 Claims. (Cl. 75-426) Range Preferred Alloy Carbon 1-4. 25 2. 5 Silicon 1-4 2. 0 Manganese 4-8 6 Chromium 1030 Iron Balance Balance Patented Aug. 20,

In connection with the foregoing range, it is desirable that the higher the manganese, the higher should be the silicon. For example, when the silicon is 1-3%, the manganese should be 4-7%, and when the silicon is 24%, the manganese should be 5-8%. When this proportional relationship is adhered to, i. e., increasing the manganese as the silicon is increased, the alloy becomes non-magnetic.

The alloys, in the as Welded condition, have a Rockwell C hardness of 30-45, and the hardness increases to over 50, on peening.

It is to be understood that the expression the remainder being substantially iron, as used in the claims, is to be construed as including any other ingredients or impurities in relatively small or trace amounts, which are found associated With the various constituents of the alloy.

Having thus described our invention, We claim:

1. A self-hardening alloy consisting of from about 1% to about 4.25% carbon, from about 1% to about 4% silicon, from about 4% to about 8% manganese, and from about 10% to about 30% chromium, the remainder being substantially iron, and the silicon and manganese being maintained at all times in such proportional relationship that the alloy is non-magnetic, said alloy having a Rock- Well C hardness, in the as-welded condition, of 30 to 45.

2. A self-hardening alloy, as defined in claim 1, in which, when the silicon content is in the range of 1 to 3%, the manganese content is from 4 to 7%, and when the silicon content is in the range of 2 to 4%, the manganese content is from 5 to 8%.

References Cited in the file of this patent UNITED STATES PATENTS 1,671,384 Stoody May 29, 1928 

1. A SELF-HARDENING ALLOY CONSISTING OF FROM ABOUT 1% TO ABOUT 4.25% CARBON, FROM ABOUT 1% TO ABOUT 4% SILICON, FROM ABOUT 4% TO ABOUT 8% MANGANESE, AND FROM ABOUT 10% TO ABOUT 30% CHROMIUM, THE REMAINDER BEING SUBSTANTIALLY IRON, AND THE SILICON AND MANGANESE BEING MAINTAINED AT ALL TIMES IN SUCH PROPORTIONAL RELATIONSHIP THAT THE ALLOY IS NON-MAGNETIC, SAID ALLOY HAVING A ROCKWELL C HARDNESS, IN THE AS-WELDED CONDITION, OF 30 TO
 45. 